Method of making container closures



Sept. 1, 1931- J. M. HOTHERSALL METHOD OF MAKING CONTA I NER CLOSURES Filed June 23, 1928 ATTORNEY Fatented i, 1%31 untrue stares PATENT OFFICE.

JOHN M.

COMIPAINY, OF NEW METHQD 015' Application filed June 23, 1928.

My invention relates 111 general to container closures and the method of making the same. and has more partictular reference to a multipart closure made from a one piece blank.

An object of my invention is the provision of a method for producing such a multipart closure from a one piece blank in an economical manner without any spoilage or Waste and by a minimum number of operations.

Another object of my invention is to make a closure made by the aforementioned method, which, by slight modifications in its con struction and in the method of making the same, can be adapted to a variety of difierent containers and inla variety of different combinations.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

Referring to the drawings:

Figure 1 is a perspective view of one form of container in which myinvention is cmbodied;

Fig. 2 is a perspective view of the finished parts of the container and the closure elements as they appear after the seal has been broken;

Fig. 3 is a perspective view of the blank used for forming the two parts of the closure shown in Figs. 1 and 2:

Fig. 1 is a view of the blank after it h been altered by the first operation;

Fig. 5 is a view similar to F 4 illustrating the second operation,-that of severing the altered blank into two parts;

Fig. 6 is a fragmental verticai sectional view illustrating the inner element of the closure after the third and final operation has taken'place;

Fig. 7 is a fragmental vertical sectional view of the upper parts of the container an the closure elements after the seal has been formed between the container and closure elemeuts;

Fig. 8 is a fragmcntal vertical sectional 'fragmenta-l vertical sectional HOTI'IERSALL, OF BROOKLYN, NEW YORK, ASSIGNOR T0 AMERICAN CAN YORK, N. Y., A CORYORATION OF N'EW- JERSEY MAKING CONTAINER CLOSUBES Serial No. 287,862.

view of the die parts used in the first operation to obtain the result illustrated in F g. 4

Fig. 9 is a. fragment-a1 vertical sectional viewshowing portions of a cutting die for severing the altered blank into two closure elements and obtaining the results disclosed in Fig. 5;

Fig. 10 is a fragmental vertical sectional view of parts of the forming die for finally forming or curling the inner element of the closure and obtaining the results disclosed in Fig. 6, and

Fig. 11 is a fragmental vertical sectional detail of a completed closure embodying my invention in a slightly modified form.

To illustrate a preferred embodiment of my invention, I have shown in the drawings a conventional type of container comprising a cylindrical body 11 of sheet metal having a side seam 12 and a bottom end double-seamed or otherwise permanently secured thereto.

A short distance below the top of the container body 11, the annular wall of the body is bent or beaded inwardly to form an outward, annular groove or depression 14. Just above this depression 14, the metal of the body continues straight upwardly at 15 and is then bent inwardly, downwardly and outwardly to form a rounded container top or curl 16. The inwardly extending curved top part of the curl 16 forms a supporting seat 17, and the downwardly extending curvet inner part of the curl 16 forms a friction seat 18 for the inner element of the closure yet to be described in detail.

Reference numeral 19 indicates the blank from which my improved two piece closure (shown in Fig. 2) is to be formed. This blank 19 consists of a fiat, circular disc of sheet metal having a tongueextension 20 with aperforation 21 therein and a tearing notch 22 at the meeting point of the periphcry of the circular disc and one side of the tongue extension 20.

To form my improved two-piece closure, namely, outersealing band or ring 60, the blank 19 is placed in a suitable die mechanism (shown in Fig. 8) consisting of a lower die member 9.3, upper die member 2i and an annular die annular concavity of the cover curl 42 before all of its material advantages, the form herethe same is applied to the can body 11. When inbefore described being merely a preferred, Ila

ring 25. By this first die operation, the engages withthe curled flange42ofthe cover blank 19 is formed into the shape shown in 50 and the straight depending annular wall ig. 4, resulting in a cup-shaped member 29 of the ring is then bent inwardly by any aving a horizontal. circular, depressed botsuitable closing mechanism untilv the lwertom or panel 26. a vertical annular wall 27, most edge of the part 29 lies within the annu- 70 and an outwardly and downwardly curved lar depression 14 of the container body 11. 7 part 28 terminating into an annular vertical This results in a very tight closure for the part 29 parallel with the Vertical wall 27. container body 11. i

his partially formed or altered closure As stated in the first part of this sp'eoificablank is then subjected to the second die option, the principle of my invention is applica- 75 eration (illustrated in Fig. 9). This die ble to a variety of different forms of con mechanism consists of a lower supporting talners and in a variety of different combinachuck 30 having a supporting part 31 of subtlons. Fig. 11 illustrates one such modified stantially the same configuration as the inm of my invention. Here the container side surface of parts 27, 28 and 29 of the albody 11 is not depressed near the top and in- 80 tered blank, an upper complementary annustead of an inward curl has its top formed into lar clamping chuck 32 and a cutting die 33 an outward curl or bead 44. The packing 43 having a sharp cutting edge 34 adapted to and the outer closure or ring 60 are substan- I engage and cut the one-piece altered closure tlally the Fame as the corresponding parts lank along the annular line of severance 35, shown in Fig. 7. The cover 50 has a friction 35 which line is located at the junction'of the wall part which closely hugs and runs parts 27 and 28. This cutting operation re parallel with the body wall 11 and thencethe sults in two closure elements. namely, the parmaterial of the cover is rebent upon itself at tially formed inner element or cover and 46 to form a vertical wall 47 and is again bent the finished outer element or sealing ring or at 48 at right angles to the vertical wall 47 to hand 60. form a raised horizontal panel 49. All these The partially formed inner closure clcmodifications are accomplished by a suitable ment or cover 50, with its straight wall 27, change in die construction and action, which is now ready to be subjected to the third and need not be illustrated or described in detail final operation. For this purpose it is for a complete understanding of my inven placed in the die mechanism shown in Fig. tion. 10, which comprises a lower chuck 38 for sup- From the foregoing it will be readily apporting the bottom or panel part 26 of the preclated that my invention is not limited to inner closure member 50, an upper clamping the exact construction of the container tops chuck 39, a lower curling die 40 and an upper and covers or the exact shape of the sealing curling die 41. The substantially straight bands illustrated in the drawings.

and upper curling dies and when the two die wardly and upwardly, or preferably a nail parts come together, the upper part of the or other sharp instrument may be inserted straight wall 27 is curled into an annular into the hole 21 of the tongue 20 to assist in arched flange 42 (shown in Fig. 6), which the pulling action. The notch 22 will then completes the formation of the inner closure assist in starting a line of severance across' member 50. This inner closure member 50 the metal of the band. Fig. 2 shows the sealtogether with t e outer closure member or lng band severed adjacent the tearing tongue trated in Fig. 7). of its attendant advantages will be underv If an hermetic seal is desired, any suitable stood from the foregoing description, and it lininq or packing material 43 may be interwill be apparent that various changes may be posed between the body curl 16 and the inner made in the form, construction and arrangeclosure curl or flange 42. This may be done ment of the parts without departing from the y applying the packing material 43 to the spirit and scope of the invention or sacrificing the container body 11 is to be finally sealed, embodiment thereof. the cover 50, with or without the packing maclaim:

)0 so that the curled flange 28 of the ring 60 condition, then subjecting this altered blank I to a cutting operation resulting in an unfinished closure element and a finished closure element, then subjecting the unfinished closure element to another forming operation to produce a second finished closure element. 2. The method of producing a multi art closure for containers from a one piece b ank without spoilage or waste, which comprises dividing a closure blank into inner disk and m outer ring parts, forming said inner and outer parts into a disk with a shoulder and edge flange and a U-shaped ring 'respectively for overlapping relation at the seam to the container body and compressing said parts to fqrm said seam with the outer part embracing the inner part and the edge of the body wall.

3. The method of producing a multipart closure for containers from a one piece blank without spoilage or waste, which consists in subjecting a flat blank to a forming operation whereby the blank is altered into a form which contains the closure elements, ultimatelyto be produced, in partially formed condition of an outside U-shaped ring and an inner flat plate, then subjecting this altered 'blank to a cutting operation resulting in an unfinished central closure plate element and I a finished outer U-shapcd ring closure ele- Inent, then subjecting the unfinished central closure element to another finishing operation producing an edge flange therearound. 4. The method of producing a multipart closure for containers from a one piece blank without spoilage or waste of material, which consists in subjecting the material from Y which the closure parts areto be made to a forming operation which results in a form of the material containing the multiple closure 40 parts, ultimately to be produced, in partially finished condition, subjecting the said form to a severing operation resulting in an unfinished closure part and a finished closure part, and finally subjecting said unfinished closure part to another finishing operation. 5. The method of sealing a container which consists in forming a circular blank with a marginal part having an inner shoulder and an outer depending flange and'with a central 1 plate part; then severing said parts on a circularline so as to leave said central part with a' central plate and an upstanding shoulder and to leave said marginal part with an inwardly extending V fiange and an outer depending flange; then pressing and drawing outwardly the upper part of said upstanding shoulder of the, central partythenapplying I the latter on the mouth of a container having an outer shoulder, with said marginal part superposed on said central part;'and then j pressing said parts to the container and bending said depending flange to engage under the shoulder of the container. ,t

JOHN M. HOTHERSALL. 

